Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7cb65095ac851a…

MALICIOUS

PDF

86.9 KB Created: 2021-07-04 02:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c2ceba788ee9814ff0e3e068aeb244b5 SHA-1: 333e62ea4604ae885cfb2930d891f852635ff6ed SHA-256: 9c7cb65095ac851a177c6f83c3d9748055723696b34016ceb258210dbb203d13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document that contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=knitting+with+two+circular+needles PDF link annotation
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/a6b6bf02e5cf4fbaa3bc04435bfa5f8e/tekoz.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/b0voua2r8cu4kbqqn7n2q977qf/20121765543.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/vewupa.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/widodigone.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/23793619072.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcdfb22343---komivemenusosu.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/9a4195694509ff6d5f5c3449ea72edf6/97602805361.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/vqhr3kd3j7qqmlhbrh30n66as0/93239716256.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/39607511837.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/bb5c0e5fac66e912df42f9c82168749d/19015779111.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/92939898359.pdfIn PDF document text
    • http://fitviewer.biz/files/file/sulegosewal.pdfIn PDF document text
    • http://recrute.fr/files/files/24047651532.pdfIn PDF document text
    • http://pinxedien.net/upload/files/jimevowu.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/fb0f906ee12860ee5a46f3e88da83a06/kadaxizuromipogosev.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160956c7472e4b---13159396335.pdfIn PDF document text
    • https://kopari.hu/files/file/19843009908.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/cc6a6237bfb13df4ca3eba0acdf0c6a8/78916173626.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/1vvhni7nnfcbikel1knj0kq436/xamifato.pdfIn PDF document text
    • http://proxima-design.cz/files/file/79252304377.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/70779133047.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/67478045619.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/2693b1ab36f179cdc7667d09fe16c845/74312608405.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089f95c8c9b3---pufamomalatexejufedirufix.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 16892 bytes
SHA-256: f8abc861572f33b6d54548ac0f11e9ea81b6afd664269fbdda142d0c4b71c5b0
font_01_sfnt_off00011d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13594 10828 bytes
SHA-256: 365d0995e6d4c5ffd59e86dba0e168f2a03fd13c0aee4b91d8f8f56739c93db8

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